One embodiment relates to a method for transmitting data via an optical network comprising a plurality of optical nodes, in which at least one wavelength is dedicated to the transmission, in the network, of data bursts transmitted by at least one source node and wherein the data bursts are intended for an addressee node. The method may comprise transmitting a control message from the addressee node to the at least one source node wherein the control message is conveyed in an optical signal emitted according to the wavelength dedicated to the transmission, in the network, of data bursts intended for the addressee node.